linux-kernel - Re: [PATCH] kgdb: Removed kmalloc returned value cast

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Message-ID: <CAEnQRZB3MGgmDwY8+bHc60f6vts5TgyhBycvhSwn9s6O4px5ow@mail.gmail.com>
Date:	Sun, 10 Mar 2013 21:05:25 +0200
From:	Daniel Baluta <daniel.baluta@...il.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Alex Grad <alex.grad@...il.com>, benh@...nel.crashing.org,
	paulus@...ba.org, mikey@...ling.org, tiejun.chen@...driver.com,
	jason.wessel@...driver.com, fr@...b.auug.org.au,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kgdb: Removed kmalloc returned value cast

On Sun, Mar 10, 2013 at 4:10 PM, Pekka Enberg <penberg@...nel.org> wrote:
> On Sun, Mar 10, 2013 at 3:06 PM, Alex Grad <alex.grad@...il.com> wrote:
>> Signed-off-by: Alex Grad <alex.grad@...il.com>
>> ---
>>  arch/powerpc/kernel/kgdb.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
>> index 5ca82cd..c1eef24 100644
>> --- a/arch/powerpc/kernel/kgdb.c
>> +++ b/arch/powerpc/kernel/kgdb.c
>> @@ -159,7 +159,7 @@ static int kgdb_singlestep(struct pt_regs *regs)
>>         if (user_mode(regs))
>>                 return 0;
>>
>> -       backup_current_thread_info = (struct thread_info *)kmalloc(sizeof(struct thread_info), GFP_KERNEL);
>> +       backup_current_thread_info = kmalloc(sizeof(struct thread_info), GFP_KERNEL);
>
> Looks good to me.
>
> There's two additional problems in the kgdb_singlestep() function: it
> doesn't check if the kmalloc() call fails nor does it kfree() the
> allocated memory.

Hi Pekka,

Indeed there is no check if kmalloc() fails. This should be fixed.

Anyhow, commit fefd9e6f powerpc: kernel/kgdb.c: Fix memory leakage
fixed the problem with kfree.

thanks,
Daniel.
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